When a stonemason is found dead in a cemetery, Inspector Moser is called to investigate the murder. A possible motive is the theft of Beethoven's skull the previous night. Inspector Moser and Rex have to trace down a killer and a thief.

A businessman is murdered outside his night club. Moser arrests a suspect shortly after the assassination and his team tries to interrogate him with no results. The man is part of a hired assassins network and gets to have Rex kidnapped. Richard Moser has to find Rex and keep the suspect from getting away.